Stoner app lets cannabis users keep track of how high they are

Dude, am I stoned? An app that tests memory, attention and reaction – traits that are often impaired by cannabis use – aims to answer that question by giving people a measurement of how well (or badly) they performed.

Cannabis is now legal in a small but growing number of countries. Researchers at the University of Chicago made the app in the hope that it will make cannabis use safer, helping those who take it understand how the drug is affecting them. “One of our long-term goals is …